The primary (essential components) & Sunnah of an Islamic wedding are two, namely:
1) Nikah: This is where marraige is conducted between a man and a woman and the Sunnah/Obligatory components are these:
a) Wali: The Sister should be represented by a Parent/Guardian who understands her wishes and can accurately and righfully represent her
b) Two Male Witnesses: The Nikah needs to conducted in front of two Male witnesses, can be 1 male and 2 female (in the Madhab of Imam Abu Haneefa (RA)) but 2 men preferred
c) Mah'r: This is amount which is the right of the girl and boy offers it to her as a Token of his love and appreciation. This is agreed between future (Insha'Allah) husband and wife according to the financial situation of the husband and family/status of the wife
d) Khutbah: A short sermon after the ceremony of Nikah in which the duties and responsibilities of both husband and wife and highlighted
2) Walima: This is the wedding feast by the husband to announce and inform the community that a family has been added

This is Sunnah and not a requirement and has no bearing on Nikah
Anything apart from that can be adopted as long as it:
a) Does not break any Islamic injunctions
b) Does not resemble or is borrowed from unIslamic customs and traditions
The prime example of something which is borrowed from Hindus in Indian/Pakistan culture is Mehndi (Henna Party). Application of Henna (Mehndi) is Sunnah and a woman is encouraged to beautify herself but the addition of this custom is purely unIslamic and the activties which are carried out are also unIslamic.
Amongst the Arabs & Pushtun the exhorbient amounts of Mah'r requested by Sisters is excessive thus causing many to not get married.
A young Brother or Sister should look into following the Sunnah and resist the temptation to give into cultural practises (which are foreign to Islam or contradictory to Islam) because Allah (SWT) clearly says:
[3:31] Say (O Prophet): If you really love Allah, then follow me, and Allah shall love you and forgive you your sins. Allah is Most-Forgiving, Very-Merciful.
[3:32] Say: Obey Allah and the Messenger. Then, should they turn back, Allah does not love the disbelievers.
If you want your life and your marraige to be blessed then follow the Sunnah.